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With the Thomson scattering (TS) system in KSTAR, temporal evolution ofelectron temperature ($T_e$) is estimated using a weighted look-up table methodwith fast sampling ($1.25$ or $2.5$ GS/s) digitizers during the 2014 KSTARcampaign. Background noise level is used as a weighting parameter withoutconsidering the photon noise due to the absence of information on absolutephoton counts detected by the TS system. Estimated electron temperature duringa relatively quiescent discharge are scattered, i.e., $15$\% variation on $T_e$with respect to its mean value. We find that this $15$\% variation on $T_e$cannot be explained solely by the background noise level which leads us toinclude photon noise effects in our analysis. Using synthetic data, we haveestimated the required photon noise level consistent with the observation anddetermined the dominant noise source in KSTAR TS system.

Quantifying noise sources in the KSTAR 2014 Thomson Scattering system from the measured variation on electron temperature